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Applet on Mac OS X 10.9.4. hangs on CAccessible.selectionChanged ()

Our java applet sometimes hangs when working with a dialog on Mac OS X 10.9.4. always with one thread dump:

"AWT-EventQueue-2" prio=5 tid=0x00007fb599138800 nid=0xbd03 runnable [0x000000010fa75000]
           java.lang.Thread.State: RUNNABLE
            at sun.lwawt.macosx.CAccessible.selectionChanged(Native Method)
            at sun.lwawt.macosx.CAccessible.access$300(CAccessible.java:44)
            at sun.lwawt.macosx.CAccessible$AXTextChangeNotifier.caretUpdate(CAccessible.java:138)
            at javax.swing.text.JTextComponent.fireCaretUpdate(JTextComponent.java:407)
            at javax.swing.text.JTextComponent$MutableCaretEvent.fire(JTextComponent.java:4417)
            at javax.swing.text.JTextComponent$MutableCaretEvent.mouseReleased(JTextComponent.java:4473)
            at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
            at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
            at java.awt.Component.processMouseEvent(Component.java:6516)
            at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
            at java.awt.Component.processEvent(Component.java:6281)
            at java.awt.Container.processEvent(Container.java:2229)
            at java.awt.Component.dispatchEventImpl(Component.java:4872)
            at java.awt.Container.dispatchEventImpl(Container.java:2287)
            at java.awt.Component.dispatchEvent(Component.java:4698)
            at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
            at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
            at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
            at java.awt.Container.dispatchEventImpl(Container.java:2273)
            at java.awt.Window.dispatchEventImpl(Window.java:2719)
            at java.awt.Component.dispatchEvent(Component.java:4698)
            at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
            at java.awt.EventQueue.access$200(EventQueue.java:103)
            at java.awt.EventQueue$3.run(EventQueue.java:694)
            at java.awt.EventQueue$3.run(EventQueue.java:692)
            at java.security.AccessController.doPrivileged(Native Method)
            at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
            at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
            at java.awt.EventQueue$4.run(EventQueue.java:708)
            at java.awt.EventQueue$4.run(EventQueue.java:706)
            at java.security.AccessController.doPrivileged(Native Method)
            at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
            at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
            at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
            at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
            at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:154)
            at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:182)
            at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:221)
            at java.security.AccessController.doPrivileged(Native Method)
            at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:219)
            at java.awt.Dialog.show(Dialog.java:1082)
            at java.awt.Component.show(Component.java:1655)
            at java.awt.Component.setVisible(Component.java:1607)
            at java.awt.Window.setVisible(Window.java:1014)
            at java.awt.Dialog.setVisible(Dialog.java:1005)

    "RMI TCP Connection(11)-127.0.0.1" daemon prio=5 tid=0x00007fb59989a800 nid=0x11f03 runnable [0x000000011a78f000]
       java.lang.Thread.State: RUNNABLE
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.read(SocketInputStream.java:152)
        at java.net.SocketInputStream.read(SocketInputStream.java:122)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
        - locked <0x00000007f61dbab8> (a java.io.BufferedInputStream)
        at java.io.FilterInputStream.read(FilterInputStream.java:83)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:538)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:811)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:670)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)

       Locked ownable synchronizers:
        - <0x00000007fecbf608> (a java.util.concurrent.ThreadPoolExecutor$Worker)

    "RMI TCP Connection(9)-127.0.0.1" daemon prio=5 tid=0x00007fb599404800 nid=0x11d03 runnable [0x000000011a68c000]
       java.lang.Thread.State: RUNNABLE
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.read(SocketInputStream.java:152)
        at java.net.SocketInputStream.read(SocketInputStream.java:122)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
        - locked <0x00000007f635acf0> (a java.io.BufferedInputStream)
        at java.io.FilterInputStream.read(FilterInputStream.java:83)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:538)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:811)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:670)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)

       Locked ownable synchronizers:
        - <0x00000007fecc0c90> (a java.util.concurrent.ThreadPoolExecutor$Worker)

    "RMI TCP Accept-0" daemon prio=5 tid=0x00007fb59cb8a000 nid=0xdb4f runnable [0x0000000117eb6000]
       java.lang.Thread.State: RUNNABLE
        at java.net.PlainSocketImpl.socketAccept(Native Method)
        at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:398)
        at java.net.ServerSocket.implAccept(ServerSocket.java:530)
        at java.net.ServerSocket.accept(ServerSocket.java:498)
        at sun.management.jmxremote.LocalRMIServerSocketFactory$1.accept(LocalRMIServerSocketFactory.java:52)
        at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(TCPTransport.java:388)
        at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(TCPTransport.java:360)
        at java.lang.Thread.run(Thread.java:745)

       Locked ownable synchronizers:
        - None

    "Java Plug-In Pipe Worker Thread (Client-Side)" daemon prio=5 tid=0x00007fb59a137800 nid=0xab07 runnable [0x000000010f0f8000]
       java.lang.Thread.State: RUNNABLE
        at com.sun.deploy.net.socket.UnixSocketImpl.unStreamSocketRead(Native Method)
        at com.sun.deploy.net.socket.UnixDomainSocket.read(Unknown Source)
        at com.sun.deploy.net.socket.UnixDomainSocket.read(Unknown Source)
        at sun.plugin2.ipc.unix.DomainSocketNamedPipe.read(Unknown Source)
        at sun.plugin2.message.transport.NamedPipeTransport$SerializerImpl.read(Unknown Source)
        at sun.plugin2.message.transport.NamedPipeTransport$SerializerImpl.readByte(Unknown Source)
        at sun.plugin2.message.AbstractSerializer.readInt(Unknown Source)
        at sun.plugin2.message.transport.SerializingTransport.read(Unknown Source)
        at sun.plugin2.message.Pipe$WorkerThread.run(Unknown Source)

       Locked ownable synchronizers:
        - None

    "AppKit Thread" daemon prio=5 tid=0x00007fb5990b0800 nid=0xd07 runnable [0x00007fff5e484000]
       java.lang.Thread.State: RUNNABLE
        at sun.lwawt.macosx.LWCToolkit.doAWTRunLoop(Native Method)
        at sun.lwawt.macosx.LWCToolkit.invokeAndWait(LWCToolkit.java:570)
        at sun.lwawt.macosx.LWCToolkit.invokeAndWait(LWCToolkit.java:511)
        at sun.lwawt.macosx.CAccessibility.invokeAndWait(CAccessibility.java:75)
        at sun.lwawt.macosx.CAccessibility.accessibilityHitTest(CAccessibility.java:388)

       Locked ownable synchronizers:
        - None

It hangs in its own CAccessible.selectionChanged () method.

The damage is unpredictable, but always when the user is working with dialogs. Starting from Java 7 Update 55, older versions of Java or other OS (windows, linux) work without this problem.

OS = Mac OS X 10.9.4

Java = runs on Java 7u55, also simulates on 7u67 and Java 8.

I can't find anything on this issue, no help? Thank...

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2 answers


This issue was a problem in Java 8u65. Came out via this worthwhile OpenJDK ticket:

https://bugs.openjdk.java.net/browse/JDK-8068222



The bug report comments mention that the issue may arise from OSX VoiceOver Accessibility. Disabling dubbing does nothing to fix the problem and thread blockages continue to occur, eventually blocking the application entirely.

However, on further search, I came across this SO question which hinted at possible issues with application accessibility issues. I followed the answer in this post and disabled all apps in System Preferences > Security & Privacy > Accessibility

and didn't get the error again. I was able to identify the problematic application by re-enabling the applications one by one and testing over time. Not a perfect solution, but a functional workaround in my case.

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use SwingUtilitys.invokeAndWait as warpper. See http://springflex.blogspot.com/2014/09/my-practices-to-resolve-applet-stuck.html for details .



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